MRI: Acquisition of an All Digital Multiparameter Gamma Spectroscopy System for Research and Research Training in Nuclear Physics

MRI：采购全数字多参数伽马能谱系统，用于核物理研究和研究培训

• 批准号: 1531763
• 负责人: Paul Voytas
• 金额: $ 7.5万
• 依托单位: Wittenberg University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1531763&HistoricalAwards=false
• 关键词: MRI; Acquisition; Digital; Multiparameter; Gamma

The weak interaction, one of the four fundamental forces of nature, is responsible for the type of radioactive decay called beta decay. Precise measurements of beta decay can probe the limits of our understanding of the weak interaction, complementing particle collider experiments in the search for new physics while being much less costly. The recent development of facilities, such as at the National Superconducting Cyclotron Laboratory, that can produce a variety of beams of radioactive isotopes has created new opportunities for improved beta decay measurements. To fully exploit the potential of these new isotopes requires a good understanding of the response of various types of particle detectors. Understanding the response of particle detectors is also important for many applications in homeland security, nuclear safeguards, and medicine. The instrument to be acquired through this grant will enable the measurement of the response of a variety of particle detectors to a new level of precision over a wide energy range. Precise measurements of the shapes of spectra in nuclear beta decay are sensitive to physics beyond the Standard Model of particle interactions. The recent development of powerful radioactive beam facilities has created a new opportunity for improved measurements of nuclear beta spectrum shapes through implantation of the nuclei in detectors that fully contain the emitted particles. In the ideal case, this provides measurements free of many of the systematic effects more conventional beta spectroscopy is subject to. Fully exploiting the potential of the new detector method, however, requires precise knowledge of implantation detector response. This detector response characterization is the primary research to be enabled by the proposed acquisition of an all-digital multi-parameter gamma spectroscopy system. The basis of the characterizations is the Wide Angle Compton Coincidence technique. This technique uses Compton scattering with standard gamma sources of modest strength to characterize the energy dependent electron response of essentially any detector material relative to, for example, a High Purity Germanium detector. The system acquired under this proposal will enable the measurement of the nonlinearity of a wide variety of detectors to a new level of precision and over a wider energy range than presently exists.

弱相互作用是自然界的四种基本力之一，它导致了被称为β衰变的放射性衰变。β衰变的精确测量可以探测我们对弱相互作用的理解的极限，补充粒子对撞机实验以寻找新的物理学，同时成本更低。最近，国家超导回旋加速器实验室等设施的发展，可以产生各种放射性同位素束，为改进β衰变测量创造了新的机会。为了充分利用这些新同位素的潜力，需要很好地理解各种类型的粒子探测器的响应。 了解粒子探测器的响应对于国土安全、核保障和医学中的许多应用也很重要。通过这笔赠款获得的仪器将使各种粒子探测器的响应测量能够在广泛的能量范围内达到新的精度水平。精确测量核β衰变中的光谱形状对粒子相互作用标准模型之外的物理学很敏感。最近发展的强大的放射性束设施创造了一个新的机会，通过在完全包含发射粒子的探测器中植入原子核来改进对核β谱形状的测量。在理想的情况下，这提供了测量自由的许多系统e#64256; ect更传统的β光谱是服从。然而，充分利用新的探测器方法的潜力，需要精确的植入探测器响应的知识。该探测器响应表征是通过建议的全数字多参数伽马能谱系统的获取来实现的主要研究。表征的基础是广角康普顿符合技术。该技术使用具有中等强度的标准伽马源的康普顿散射来表征基本上任何检测器材料相对于例如高纯锗检测器的能量相关电子响应。根据这一提议获得的系统将使测量各种探测器的非线性达到一个新的精度水平，并在比目前存在的更宽的能量范围内。